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Производство оборудования и технологии
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Casing Leaks

In repairing the casing leaks, one can either (1) isolate the leak with a packer (inexpensive) or (2) replace the casing (very expensive). Casing leaks can cause1 loss of production and. possibly, eventual loss of a well. The log of cumulative1 leaks is often a linear function of time (Fig. 6.6). The curve is often an approxi­mate one, because in many cases casing leaks can go undetected for long time. In many cases, however, the extrapolation of the leak-frequency versus time curve is surprisingly accurate and can aid in an economic analysis (feasibility of cathodic protection).

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YEARS BEFORE AND AFTER PROTECTION

Fig. 6.6: Leak frequency, C’lairmont Field. Kent County. TX. (After Kirklen. 1973, fig. 4; courtesy of the SPE.)

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